Transcript for Returning to the Football Field Where a High School Player Collapsed

tragedy. A high school football player, collapsing during a game. Cameron Matthews, the latest to lose his life. Here's Ron Claiborne. Reporter: In tribute and in grief, classmates and teammates circled the football field where Matthews collapsed. Moments after telling the coach he didn't feel right. He was airlifted to a nearby hospital. He died the next day. So many people gathering here, it's very fitting, at the football stadium, where he spent so much of his time. Reporter: Just weeks into the football season, Matthews is the sixth player to die. Although it's not yet confirmed his death is football related. Since 2005, the deaths of 36 football players have been attributed to on the field injuries. Two weeks ago, 17-year-old Kenny Bui died days after sustaining a head injury in a game in Seattle. An autopsy concluded he died of blunt force trauma. Catastrophic head injuries occur much more frequently at the high school level. One theory why -- few high schools have the sideline medical staff that college and pro teams do. They're still not getting the same medical care that the average college player is getting. Reporter: With two more months of high school football, tonight the concern -- the likelihood there will be more injury. Ron Claiborne, ABC news, new York.

This transcript has been automatically generated and may not be 100% accurate.

Tyrell Cameron, 16, died after being injured on what coaches called a routine play.

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